This seems to be this issue:

https://github.com/ContinuumIO/anaconda-issues/issues/152

Perhaps try this solution suggested in the comments of that issue:

https://github.com/ContinuumIO/anaconda-issues/issues/152#issuecomment-225214743

On Tue, Nov 21, 2017 at 2:27 PM David Collins <dcollins4096@gmail.com> wrote:
Hi, Everybody!

I'm running yt on Pleiades, and I'm running into a readline error (below)
Has anyone else run into this, and do you know what I can do to fix this?  This is a recent build, not from source.

Thanks!

pleiades:~/yt3_scripts>python
Python 2.7.13 | packaged by conda-forge | (default, May  2 2017, 12:48:11)
[GCC 4.8.2 20140120 (Red Hat 4.8.2-15)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
Traceback (most recent call last):
  File "/etc/pythonstart", line 7, in <module>
    import readline
ImportError: /u/dccolli1/local-yt-2017-09-28/yt-conda/lib/python2.7/lib-dynload/../../libreadline.so.6: undefined symbol: PC
>>>  


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